I'm don't really know what a lot of the styles you wrote are. I think wearing it down and straight looks best, the more uniform looking the better. And extra body is good too. As far as length goes I like it between chin and shoulder length but I think most guys like it a little longer.
My sister just got a haircut which was pretty much a long bob with straight bangs, which a lot of girls are doing today, but when my boyfriend saw her he told me later that all his guys friends would make fun of anyone with that hair style and refer to it as the "Darth Vader" hair cut, because its shape around the face looks like the Darth vader mask. Later that night we went over to visit some family and one of my Uncles said the same thing! Apparently this is not a good haircut when it comes to guys opinions.